Process of making firebacks for gas-stoves



A, .LU/IPHREY,

PROCESS 0F r-nAKmG HREBACKS FOR GAS STOVES.

APPLICAUON FILED MAY 3, i920.

Pa-tenfte Nov. 8, H2L

A. H. HUMPHREY.

mocEss 0F MAKING HHEBACKS FOR GAS STovEs.

APPLlCATlON FILED MAY 3, 1920,

Patented Nov. 8, 1921.

Unirse STATES PATENT OFFICE.

LFRET) Ii. HUMEHREY, 0F NEW YORK, N. Y., ASSIGNOR TO GENERAL GAS LIGHT CGVIFANY, DF KALAIvIAZOO, MIGHIGAN.

R-OCESS OF MAKING- IFREBACES EGR' GAC-STOVES.

renonce.

Specification of 'Letters Patent.

Patented Nov. 8, 1921.

Application Ied May 3, 1929. Serial No. 378,587.

of New Yori; have inyentcd'certziin new sind us i improvements in Processes of Making ireloficks for {1 stoves, of which oiio Wi 'icstion` Tl i relates to improvements in the p1 making iirehacks 'for stoves.

My improved pr :i'ole for meloni cess is especially desirhis inveiition are:

A, rom-.ss of 'with raised Heugecol. d.

` .iz'oved process inherits haring; border oiored i'o produce :in ory zipper-tr 1. =scription 'o follow. :he objects of my invention hy ine device and means described in the following spe-J on. The invention is clearly dehnen and pointed out in the claims.

structure which e. preferred embodi ment of my invention is clearly illustrated in Jthe accoinificnying drawinrqnorming e part of this specification, in which:

vFigure I is a front elevation of iirehsck produced hy my novel process.

Fig. H is perspective YView of n laminated pile of plastic composition iliustrating one step of the. production of the color sheets or strips.

Fig. HI is a front elevation showing zinother step ot' the process, eznely, the 'forming of the hody portion prior to the incorporation therewith at f nloi-ed material. Fig. V is n fron-; or plan View oi 'the body portion the {irehsch with the sheets or strips oi the colored composition disposed thereon.

V is un eniarged vertical section on a line corresponding; to line oi' Fig. IV, showing the mold or torni in retreated position.

Fig. VI is a sectional view oi the parts shown in V, with the mold or form actuated.

l accomplish Fig. VH is an enlarged detail yView of the ireback.

n the drawing similar reference charn ficters rei to simil-sr parts throughout the several views.

in carrying out my improved process, I first mold or form the body portion l-see Figsll, ".7 and Vil-from :i suitable plastic clay composition preferably having fine granular material such as saw dust incorporated therein, the granular material heing destroyed during the tiring so that the ireback has a more r iess porous character sind l find is not likely to Warp or crack under repeated heating and cooling and un` even heating such as occurs in use in the gas stove. Y

The reh-.ick shown is provided ii'ith raised things-like border portions Q at theV top und'ends. After forminrT this body portion l of the uncolored plastic clziycomposition, l superimpose sheets 3 of plastic clay composition preferably the same as that of which the body portion formefhupon the raised portion 2 oi? the hotly iis shown 8e in Figs. IV and V., and press the snperinn posed sheets or strips upon the plastic molded body hy mez-ins of the mold 4; as shown in Figs. V and VI, so that the sheets become an integral part or" the body.

The sheetshave portions 5 thereof indicated conventionally in Fig. IV, colored with an oxid coloring material which does not run when heated and becomes fixed by tiring. The strips 3 are preferably formed 90 by stacking alternate layers 6 and 7 of Vthe colored und uncolored plastic. material in a pile as shown in Fig. Il, and pressing together into a substantially composite or integral muss and then slicing oil' the strips 3 :is indicated hy the dotted lines in Fig. Il. This, I find, is a very practical method :1lthoug'h narrow strips or pieces of the colored composition may he laid separately upon the 'body while itis still in its plastic. condition 100 und pressed into the same.

The pressing distributes the colored chi more or less unevenly` so that :i natural e fect or :appearance is secured.

Firebiicks made by my process are very attractive in appearance. The firebzicks also vhave the further advantage of not showing discoloration from the gases or products of combustion.v

I have illustrated one method of carrying out my improved process which Il'ind yery, prauztirful in use, hut this may be considerably modified according to the product oe sired.

l, (wing thus described my invention, what I elairn s new and desire to secure by Letters '.retent, is:

1. The process of; making gres stove firebwjcks haring' e raised or flange-like portion, con'ipz'ising molding the rehaclr of e .plastic clay ron'iposition, superirnposing on the said raised porion :i plastic sheet of the same clay composition hai/'ing' alternate transverse strips of portions thereolr colored with an oxid coloring meerinl, the clay composition having :L rime granular materiel adapted io be destroyed by the SubsequentL firing step pressing the superimposed sheet upon the plastic molded body so that the sheet becomes an integral part thereof, and liring.

2. The proces-is of making gus stove lire- `backs, comprising molding the firebacks of n plastic Clav composition, superimposing thereon e plastic @heet of the sani@ clay coniiostion havin portions thereof colored the g l a clay composition having a line granular Inaterial adapted 'to be destroyedby the .enlise qnen firing step pressing the superinposed sheer, upon the plastic molded body so that the sheet becomes an. integral par: thereof, and iiring.

3. The process or' making' gas stove irebacks, comprising' moldingV the firebnclfs of a plastic: Clay composition, superiniposing plasrlic Clay eonipositioi'i colored with en oxid coloring mterial, rho clay Composition having a fine granular materiel adapted to be destroyed by the subsequent firing' step, incorporated therein, pressing the superimposed composition into the plastic molded bod)v so that they become en integral part, and firing.

In witness whereof, l have hereunto Set my hand and seal in the presence of two Witnesses.

ALr'ieD H. HUMPHREY. v.li'fitnesses LUELLA G, GREENFIELD, lll/Lammer L. GLASGOW. 

